The two links you just added look more believable than the one being discussed.
As far as the difficulty of making a fake video... Computer-generated imagery (CGI) has come a long way in the past few years. I am fairly certain that this would not be a difficult illusion to accomplish for a skilled technician. I did find a link to a video from several years ago entitled, “Tutorial: Making a String Vibrate with Audio in After Effects”.
However I noticed that this video was actually uploaded over three years ago. There are so many similar videos on YouTube uploaded by people who are most likely not capable of producing sophisticated fakes that I must now admit that the probability is that the video that started the thread is probably not a fake. Thank you for the explanations and your patience.
My brother and I made a couple fake flying videos many years ago when we first started using camcorders as a joke. It was surprising to us that most people believed that they were real.
If I think something is faked, I will research it and prove it so. . . I am a great believer in truth. And vice verse